Vulnerability · Published Aug 12, 2021 · Assigned by microsoft
CVE-2021-26423.NET Core and Visual Studio Denial of Service Vulnerability
High 7.5
In plain English
A high-severity security flaw in Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.9% (higher than 90% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)3.9%top 9.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
.NET Core and Visual Studio Denial of Service Vulnerability
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | microsoft.netcore.app.runtime.linux-arm | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-arm | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-arm64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-arm64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-musl-arm | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-musl-arm64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-musl-arm64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-musl-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-musl-x64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.linux-x64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.linux-arm | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.linux-arm64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.linux-musl-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.linux-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.llvm.aot.linux-arm64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.llvm.aot.linux-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.llvm.aot.osx-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.llvm.linux-arm64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.llvm.linux-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.llvm.osx-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.mono.osx-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.osx-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.osx-x64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.rhel.6-x64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-arm | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-arm | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-arm64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-arm64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-x64 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-x64 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-x86 | 5.0.9 | GHSA-rh58-r7jh-xhx3 |
| NuGet | microsoft.netcore.app.runtime.win-x86 | 3.1.18 | GHSA-rh58-r7jh-xhx3 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .NET 5.0 | 5.0.0 – before 5.0.9 |
| Microsoft | .NET Core 2.1 | 2.1 – before 2.1.30 |
| Microsoft | .NET Core 3.1 | 3.1 – before 3.1.18 |
| Microsoft | Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) | 15.9.0 – before 15.9.38 |
| Microsoft | Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9) | 16.10.0 – before 16.10.5 |
| Microsoft | Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) | 16.0 – before 16.4.25 |
| Microsoft | Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) | 16.0.0 – before 16.7.18 |
| Microsoft | Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) | 15.0.0 – before 16.9.10 |
| Microsoft | PowerShell Core 7.0 | 7.0.0 – before 7.0.7 |
| Microsoft | PowerShell Core 7.1 | 7.1.0 – before 7.1.4 |
| Microsoft | Visual Studio 2019 for Mac version 8.10 | 8.1.0 – before 8.10.7 |
References
- .NET Core and Visual Studio Denial of Service Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423 x_refsource_MISC, x_transferred